package com.itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.common.CustomException;
import com.itheima.entity.Category;
import com.itheima.entity.Dish;
import com.itheima.entity.Setmeal;
import com.itheima.mapper.CategoryMapper;
import com.itheima.service.CategoryService;
import com.itheima.service.DishService;
import com.itheima.service.SetMealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetMealService setMealService;

    @Override
    public void remove(Long id) {

        //添加查询条件，根据分类按id进行查询菜品数据
        LambdaQueryWrapper<Dish> Dishlqw = new LambdaQueryWrapper<>();
        Dishlqw.eq(Dish::getCategoryId,id);
        int count1 = dishService.count(Dishlqw);

        //如果已经关联，抛出一个业务异常
        if (count1 > 0) {
            throw new CustomException("当前分类下关联了菜品，才能删除");
        }

        //查询当前分类是否关联了套餐，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Setmeal> SetMeallqw = new LambdaQueryWrapper<>();
        SetMeallqw.eq(Setmeal::getCategoryId,id);
        int count2 = setMealService.count(SetMeallqw);

        if (count2 > 0) {
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }

        //正常删除分类
        super.removeById(id);

    }
}
